Add the missing depndency for the introduced use of support/Utils.h

Author: google-yfyang

utils/bazel/llvm-project-overlay/clang-tools-extra/clang-doc/BUILD.bazel

@@ -77,6 +77,7 @@ cc_binary(
     srcs = ["tool/ClangDocMain.cpp"],
     stamp = 0,
     deps = [
+        ":clang-doc-support",
         ":generators",
         ":lib",
         "//clang:ast",